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Preliminary Study on Focal Mechanism Solution and Seismogenic Structure of Qilian,Qinghai M_S5.2 Earthquake on Nov.23,2015

YANG Ping;ZHANG Hui;FENG Jian-gang;Lanzhou Institute of Seismology,CEA;Earthquake Administration of Xinjiang Uygur Autonomous Region;  
On November 23,2015,an MS5.2earthquake occurred at Qilian county,Qinghai province.By the end of the first day of December,48 aftershocks had occurred in the mainshock seismic region,including 34 ML1.0~1.9aftershocks,ten ML2.0~2.9aftershocks,and four ML3.0~3.9aftershocks,with the greatest magnitude being ML3.4.In this paper,based on the seismic network data of Gansu and Qinghai provinces,we use the cut-and-paste method to calculate the focal mechanism solution of the Qilian MS5.2.We then use the waveform fitting method for synthetic and observed seismograms to further determine the focal depth of the earthquake.The results indicate that this event occurred on a rupture plane(strike 109°,dip 58°,and slip21°),which demonstrated a left-lateral strike-slip mechanism with a minor reverse-faulting component,a moment magnitude of MW5.16,and a centroid depth of about 9km.The other nodal plane was characterized by a strike of 8°,dip of 72°,and a slip of 146°.The focal mechanism,which describes the nature and source of the rupture process,provides an important foundation for understanding the stress state of the source region and the earthquake faults,and for analyzing the causes of a seismic event.A comparison of the maps of focal mechanism solutions for the Qilian MS5.2earthquake and historical earthquakes illustrates that the focal mechanism of this earthquake is in keeping with historical focal mechanisms.Therefore,based on our comprehensive analysis,we can identify the middle of the north Tuoleshan active fault as the seismogenic structure of this event.
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